For anyone who needs to do handyman work or just regular DIY stuff- changing drill bits or hole saws for different applications or surfaces is a regular hassle. But technology never stops amazing or solving problems, and that is where bi- metal hole saws
Bi-Metal hole saws are a special type of the tool that are specialized not only for metal cutting but also for wood cutting. The name bi-metal is introduced because the construction of the hole-saw body is not continuous- meaning two different types of steels are used along different parts of the body.
Usually, the body of the hole saw is made out of flexible steel so that they can withstand or survive heavy pressure. The cutting edges of the teeth, however, are made out of one of two metals:
- HSS (High Speed Steel) with varied toothing
- HSSE- CO 8 (HSS with 8% Cobalt) with fine toothing
These types of hole saws usually have a much larger number of cutting edges than other types of hole saws; like carbide hole saws. This increment in the number of teeth means that the finish or cut is much cleaner with less jagged edges. The varied and fine configuration of the toothing prevents the hole saw from getting stuck along the material.
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ToggleBut what are bi- metal hole saws used for?
The overall answer to this question would be that they are used for almost anything to everything. Due to their flexibility, bi- metal hole saws can be used to cut many types of objects. Here a few of the specializations:
Varied toothing Bi- metal hole saw:
In the case of easily cuttable materials, the priority often becomes the cleanliness of the cut. Many types of drills may be used to perform this cutting operation, but hole saws with varied toothing allow for coarser cuts. This means cable ducts, switch openings or sockets are often cut with these hole saws as they need a more precision finish. Products where varied toothing is preferred are listed below:
Unalloyed steel, non-ferrous metals, plastics, plywood, wood etc.
More Hole saw news here.
Fine toothing bi-metal hole saw:
Fine toothing bi- metal hole saws have a relatively high cobalt content. This means these hole saws will have a high hot hardness- ensuring better structural rigidity at much higher temperatures. Fine toothing also allows for smoother and better cutting patterns at a comparatively less effort. This means of the two types of bi-metal hole saws- fine toothed ones are the heavy lifters to cut through stronger materials. Fine toothing is good for:
Alloyed steels and high cutting depth unalloyed steel, anti-rust metals, stainless steel etc.
Bi- metal hole saw size chart:
Depending on your application and opening size, the size of your hole saw will also change. Here are a few of the most common available sizes: 14mm, 16mm, 20mm, 22mm, 25mm, 29mm, 32mm, 35mm, 38mm, 41mm, 44mm, 48mm, 51mm, 54mm, 57mm, 60mm, 60mm, 64mm, 67mm, 70mm, 73mm, 76mm, 79mm, 83mm, 89mm, 95mm, 102mm, 108mm, 114mm, 121mm, 127mm, 140mm, 152mm, 177mm
Conclusion:
Picking the right tool can make your work a whole lot easier, and bi-metal hole-saws are no different. With the flexibility that this alloyed formula brings to your workbench, you will be able to cut through almost anything in no time.